## http://www.astro.wisc.edu/~dolan/constants.html

- https://ned.ipac.caltech.edu/level5/Glossary/lang_formulae.html

## relations

https://en.wikipedia.org/wiki/Bohr_radius

https://en.wikipedia.org/wiki/Fine-structure_constant

## conversions

https://www.unitsconverters.com/en/Hertz-To-Kelvin/Unittounit-3511-3514?MeasurementId=15&From=3511&To=3514

https://physics.nist.gov/cuu/Units/prefixes.html

[PPM - parts per million](https://www.adelaide.edu.au/arcpoh/dperu/fluoride/ppm.html#:~:text=This%20is%20an%20abbreviation%20for,per%20unit%20volume%20of%20water.)


## moles to grams

https://sciencing.com/determine-moles-chemistry-8561700.html

https://www.softschools.com/formulas/chemistry/moles_to_grams_conversion_formula/111/

## https://www.online-calculator.com/scientific-calculator/